Pink Floyd - I have no issues with the 2016 pressings and I have all the ones you mentioned. Can you find better, yes, but at a cost. I have OGs as well and while they sound "better", they take nothing away from the 2016s.
Led Zeppelin - I, II & III are very nice when it comes to the remasters, IV, not so much, not sure why. If you can find OG or early pressings you'll be happy with them, if nothing else, take a look at Record City for some Japanese pressings, also very good. The problem I've noticed with Zep is that their albums were purchased and listened to, a lot, and a lot, were also not taken care of very well. Locally I've never found anything I would say was worth buying, you may have better luck.